Topic
Stress concentration
About: Stress concentration is a research topic. Over the lifetime, 23250 publications have been published within this topic receiving 422911 citations.
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TL;DR: In this paper, the fatigue growth of an edge flaw in a round bar under cyclic tension or bending loading is examined, using a two-parameter numerical model, and it is shown that the crack front evolution is defined by a very small number of parameters, which varies during crack growth.
107 citations
TL;DR: In this article, a transition layer reinforced by oxidized multiwall carbon nanotubes (OCNTs) was built to synergistically improve interfacial and fatigue-resistant performance of carbon fiber/epoxy composites.
Abstract: To synergistically improve interfacial and fatigue-resistant performance of carbon fiber/epoxy composites, a transition layer reinforced by oxidized multiwall carbon nanotubes (OCNTs) was built. OCNTs were integrated onto carbon fibers using a continuous electrophoretic deposition method. Results of static and fatigue tests showed that compared with composites without OCNTs, the hierarchical composites not only showed increases of 33.3% in interfacial shear strength, 10.5% in interlaminar shear strength and 9.5% in flexural strength but also acquired 4.5% improvement in residual bending strength retention after fatigue tests. The transition layer detected by energy dispersive X-ray spectroscopy and atomic force microscope in force mode might be responsible for the above improvements. Combined with scanning electron microscopy analysis and ultrasonic C-scan detection, the functions of modified interfacial microstructure were discussed. The enhanced interface could help to reduce stress concentration and lead destructive cracks to spread along multiple paths, enhancing the damage resistance.
107 citations
TL;DR: In this article, an experimental investigation of the fatigue behavior of externally strengthened concrete with fiber-reinforced polymers (FRP) is conducted in the experimental program, strain patterns along the bonded length and the surrounding concrete are determined using digital image correlation.
107 citations
TL;DR: In this article, a series of techniques are incorporated into the original NMM (numerical manifold method) to simulate the entire process of the progressive failure of rock slopes, including strength-based LT criterion, which can account for tensile cracks, tensile shear cracks and compressive-shear cracks.
107 citations
TL;DR: Using the shear-lag model, the crack-tip stress concentrations in double-edge notch and center notch unidirectional composites of finite width were solved in this paper.
Abstract: Using the shear-lag model, we have solved for the crack-tip stress concentrations in double-edge notch and center notch unidirectional composites of finite width From the stress-state solution, expressions are derived for strain energy release rate due to crack propagation through the fibers and due to crack propagation parallel to the fibers It is pro posed that these new equations, which include geometric correction factors, may be used for fracture mechanics analyses of unidirectional composites and that their use will pro vide better physical insight into composite fracture Because the heterogeneous nature of composites is specifically taken into account, it is suggested that these new equations are superior to ones derived from classical fracture mechanics or from stress-state solutions for homogeneous materials
107 citations